JPH07325564A - Sound stopping device for piano - Google Patents

Abstract

PURPOSE:To obtain the sound stopping device for the piano which interferes with none of other parts of the piano and can easily be arranged and moved even when the movement quantity of a stop rail is made large by using a rotating mechanism. CONSTITUTION:When a player presses down a key, a damper lever 10 swings clockwise from the solid-line state against the energizing force of a damper lever spring 18 as shown by the broken line, so a damper lever wire 12 crosses the swing axis of the stop rail 20 to enter the space sandwiched by an arm 24. When, however, the damper lever wire 12 enters this space, the stop rail 20 only swings between the sound stopping position shown by the solid line and the sounding position shown by the broken line, so the damper lever wire 12 never interferes with the stop rail 20. Therefore, even when the movement quantity is increased by using the rotating mechanism as a simple mechanism, there is no interference with other parts of the piano and the arrangement and movement of the stop rail 20 are facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound deadening device for a piano, which prevents a hammer shank from moving during a string striking operation based on a key depression to prevent the hammer from striking the string.

[0002]

2. Description of the Related Art Heretofore, there has been proposed a compound piano in which an electronic sound source is combined with an acoustic piano, and in addition to a normal acoustic performance mode by striking a hammer, a performance mode by an electronic sound source can be switched. In this type of compound piano, as a sound-stopping device that prevents the hammer from striking the strings when playing with an electronic sound source, the hammer shank is brought into contact with the hammer shank during the string striking operation to stop the movement of the hammer shank. Stop rails are used.

This stop rail 90 is shown in FIG.
As shown in (a), by rotating the entire body, a stop position (solid line) that prevents movement of the hammer shank 100 and a retracted position (dashed line) that allows movement of the hammer shank 100 and enables string striking with a hammer. Was switching. In addition, as shown in FIG. 5 (b), by moving the stop rail 91 in parallel, a stop position (solid line) that prevents the hammer shank 100 from moving and a hammer shank 100 that allows the hammer shank 100 to move can be struck by a hammer. The retreat position (broken line) was switched to.

[0004]

By the way, the position where the stop rail is arranged to stop the hammer shank is between the string and the hammer shank immediately before striking, and the damper mechanism and the like are also arranged at that position. It has been a very narrow place. In such a narrow space, it is difficult to dispose the stop rail itself, and if the stop rail is moved as shown in FIG. 5 (a),
Interference with various parts inside the piano may occur. The larger the amount of movement of the stop rail, the more clearly the functions of the stop position and the retracted position can be clearly separated. However, if the amount of movement is increased, the width L of the stop rail must be increased, The moving space became bigger and larger, making it more difficult to arrange. In the case of FIG.
In order to move in parallel accurately as compared to the rotation as shown in (a), the moving mechanism is complicated and adjustment is difficult, which is a limitation.

For example, in an upright piano, a damper mechanism exists along the strings, but if the stop rail is enlarged, the damper or damper wire may enter the moving space and prevent normal operation of the damper mechanism. was there. If you try to avoid the damper mechanism, you may not be able to stop the hammer shank at the proper position just before striking the string when the sound is stopped, or the stop rail may come into contact with the hammer shank even when the sound is not stopped. There was also.

The present invention provides a sound deadening device for a piano which is easy to dispose and move without interference with other parts of the piano even if the moving amount is increased by using a rotating mechanism.

[0007]

The invention according to claim 1 is
A plurality of arms, one end of which is pivotally supported by each support portion and the other end of which is swingable about the one end, a stop rail bridged between the other ends of the arms, and a hammer striking string based on a key depression. Between the start of the operation and the actual striking of the string, a stop position that abuts on the hammer shank to prevent the hammer shank from moving and a retracted position from the stop position to enable the hammer to strike the string And a switching mechanism capable of swinging and displacing the stop rail at the retracted position.

According to a second aspect of the present invention, there is provided the sound deadening device for a piano according to the first aspect, wherein the space between the arms is a swing space of a damper or a damper wire. According to a third aspect of the present invention, the space between the arms is a swing space of a hammer or a hammer shank when striking a string.
Alternatively, the sound deadening device for a piano is described in 2.

According to a fourth aspect of the present invention, there is provided the sound deadening device for a piano according to any one of the first to third aspects, in which the corner of the stop rail on the side contacting the hammer shank is rounded. The invention according to claim 5 is the stop rail,
The sound deadening device for a piano according to any one of claims 1 to 3, wherein a surface of the side that abuts the hammer shank is a curved surface that projects.

[0010]

According to the first aspect of the invention, the stop rail is mounted between the other ends of a plurality of arms, one end of which is pivotally supported by each support portion and the other end of which is swingable. It has been passed. For this reason, even if the arm swings and the stop rail moves due to the operation of the switching mechanism, a space is formed between the arm and the arm, so that interference does not occur even if a damper mechanism or the like exists in the space. Does not happen. Even if the arm is lengthened or the swing range is further expanded and the stop rail is moved further, it is the same. Therefore, even if the amount of movement is increased by using the rotation mechanism that is a simple mechanism, there is no interference with other parts of the piano, and the arrangement and movement are easy. Furthermore, since the movement amount of the stop rail can be made large, the functions of the stop position and the retracted position by switching the stop rail can be clearly separated.

For example, the space between the arms is
Even in the swinging space of the damper or damper wire,
It is possible to prevent the damper or the damper wire from interfering with the sound deadening device to hinder the operation. The same effect can be obtained even if the space between the arms is the swing space of the hammer or hammer shank when striking the strings.

The stop rail may have the following shape. That is, the corner on the side contacting the hammer shank may be rounded, or the surface on the side contacting the hammer shank may be curved. For example, the cross-sectional shape of the stop rail may be circular or elliptical. Further, only the side that abuts the hammer shank may be partially circular or elliptical. This is achieved even if only the shape of the cushion material attached to the contact surface is used.

With such a shape of the stop rail, the hammer shank does not hit the sharp corner even if the stop position in contact with the hammer shank is finely adjusted. If it hits a sharp corner, the cushioning material that is usually provided there may not be able to support the hammer shank and may be greatly dented, and the stop position may not be determined, and the functions of the stop position and the retracted position may not be clearly separated. There is. By configuring the shape of the hammer shank as described above, the functions of the stop position and the retracted position can be clearly separated even if the stop position is finely adjusted, and the fine adjustment of the stop position is facilitated.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a partial cross-sectional view showing a schematic configuration around a sound deadening device in an upright piano provided with a first embodiment of the sound deadening device.

The upright piano is a compound piano equipped with an electronic sound source (not shown) so that a performance sound can be generated from the electronic sound source by operating a keyboard. The performance sound from the electronic sound source is emitted to the outside. It can be listened to via headphones without.

The damper mechanism is the action bracket 2
A center rail 7 which is horizontally fixed to the center rail 7 and which supports a string striking mechanism having a hammer 5 and a hammer shank 6 for striking the strings 4 in response to a player's key depression operation;
The fixed shaft 8a of the support member 8 attached to the string 4
A damper lever 10 that is swingably supported toward
The damper lever wire 12 formed of a mild steel wire and extending from the upper end of the damper lever 10, the damper head 16 provided with the felt 14 attached to the tip of the damper lever wire 12 and contacting the strings 4, and the damper lever 10 of the damper lever 10. The upper end portion and the support member 8 are respectively fixed at their end portions, and are composed of a damper lever spring 18 for urging the damper lever 10 in a direction in which the felt 14 of the damper head 16 contacts the string 4.

In the damper mechanism thus constructed, when the key is not pressed, the upper end portion of the damper lever 10 is moved to the string 4 by the urging force of the damper lever spring 18, as shown by the solid line in FIG. Since it swings in the direction, the felt 14 of the damper head 16 comes into contact with the string 4 and the vibration of the string 4 is suppressed.

On the other hand, when the player pushes the key downward, the damper lever 10 rotates clockwise against the urging force of the damper lever spring 18, so that the felt 14 of the damper head 16 is indicated by the broken line. Will move away from the string 4. At this time, when the hammer 5 strikes the string 4, a sound is generated.

After that, when the player releases the key, the damper lever 10 returns to the initial state shown by the solid line by the urging force of the damper lever spring 18, so that the felt 14 of the damper head 16 abuts the string 4. The vibration of the string 4 is suppressed. Further, in front of the hammer shank 6, there is provided a stop rail 20 that abuts on the hammer shank 6 and blocks its movement when the noise is stopped.

The structure of the stop rail 20 is shown in FIG.
The stop rail 20 includes a rail portion 22 having a circular cross section and three arms 24, 26, and 28. The rail portion 22 is provided with a stopper cushion (cushion material) 30 for absorbing an impact in the axial direction. The stopper cushion 30 has a curved surface shape which is adapted to the surface shape of the rail portion 22 and whose front surface (a surface contacting the hammer shank 6) projects.

The arms 24 to 28 are substantially L-shaped, and one ends of the arms 24 to 28 form shaft portions 24a, 26a, 28a. The shaft portions 24a, 26a, 28a are inserted into the bearing holes of the support portion 32 attached to the action bracket 2 and swingably supported.

A lever 34 is fixed to the shaft portion 24a of the arm 24 on one end side of the stop rail 20 and is connected to a switching operation lever (not shown) by a wire 36. On the side opposite to the wire 36, a spring 36 a applies a biasing force to the lever 34 against the tensile force of the wire 36. The lever 34, the wire 36, the spring 36a, and the switching operation lever correspond to the switching mechanism. A well-known pedal that performs muffler switching may be used instead of the switching operation lever.

Normally, when the sound is stopped, the wire 36 is pulled by the operation of the switching operation lever as shown by the solid line in FIG. For this reason, the lever 34 moves counterclockwise in FIG. 1, and the rail portion 22 also rotates integrally, and is in a position (stop position) where the hammer shank 6 is blocked. Therefore, the hammer 5 cannot hit the string 4 even if the player presses a key. The actual sound is output from the electronic sound source. This state is the electronic performance mode.

The action bracket that pivotally supports the arm 26 in the middle portion and its supporting portion are the action brackets 2 at both ends of the rail portion 22 shown in FIG.
Also, the shape is different from that of the support portion 32, and the rail portion 22 does not collide even if it swings as shown by the solid line in FIG. 1, and the rotation of the stop rail 20 is not blocked. Of course, if the stop rails 20 are separately provided between the action brackets, the action brackets and the supporting portions at the intermediate portion may have the same shape as the action brackets 2 and the supporting portions 32 at both ends.

When the wire 36 is returned, it becomes as shown by the broken line in FIG. That is, the lever 34 moves clockwise in FIG. 1, and the rail portion 22 is retracted from the position where the hammer shank 6 is blocked to the position where it is not blocked (retracted position). Therefore, the hammer 5 can hit the string 4 as shown by the chain line in the figure. In this way, the electronic performance mode is switched to the acoustic performance mode.

In the damper mechanism, when the key is not pressed as described above, the upper end of the damper lever 10 swings toward the string 4 by the urging force of the damper lever spring 18, as shown by the solid line in FIG. However, when the player pushes the key downward, the damper lever 10 swings clockwise as shown by the broken line against the urging force of the damper lever spring 18, so that the damper lever wire 12 is moved to the position shown in FIG. By crossing the swing axis A of the stop rail 20 indicated by the alternate long and short dash line, the arm 24, 26 or the space S sandwiched by the arms 26, 28 is entered.
However, even if the damper lever wire 12 enters the space S, as shown in FIG. 1, the stop rail 20 has a sound stop position (stop position) indicated by a solid line and a sound generation position indicated by a broken line (retracted position: striking of hammer 5). The damper lever wire 12 does not interfere with the stop rail 20 because it only swings between the damper lever wire 12 and the stop rail 20. Therefore,
Even if the rotation amount, which is a simple mechanism, is used to increase the movement amount, the stop rail 20 can be easily arranged and moved without interference with other parts of the piano.

As in the conventional case, in a stop rail in which the space S does not exist, interference completely occurs, which hinders the operation of the damper mechanism or the operation of the stop rail. Next, a second embodiment will be described with reference to FIG. The difference from the first embodiment is that the stop rail 20 is attached so as to swing above the support portion 32. With this configuration, the rail portion 22 can secure a large moving distance in the gap between the hammer 5 and the damper head 16. The lengths of the arms 24, 26, 28, the mounting position of the stopper cushion 30 on the rail portion 22, and the mounting position of the lever 34 on the shaft portion 24a are lengths and positions adapted to the arrangement of each portion in FIG. Has become.

Next, a third embodiment will be described with reference to FIG. The difference from the second embodiment is that the shaft portions 24a, 26a, 28
This means that the mounting position of a is closer to the hammer shank 6 rather than the position of the support portion 32 described above. As a result, the arms 24, 26 or the arms 26, 28
The space S between and is the hammer shank 6
Of the damper head 16, and also as a swinging space of the damper head 16. Another difference is that the lever 34 is omitted, and the wire 36 and the spring 36a (not shown) are directly attached to the arm 24, so that the structure is simpler.

Therefore, even if the amount of movement is increased by using the rotation mechanism which is a simple mechanism, the stop rail 20 can be easily arranged and moved without interference with other parts of the piano. As described above, the stop rail 20 has a high degree of freedom of arrangement and can effectively use the gap inside the piano, so that the stop rail 20 has a sufficient noise suppressing effect without changing the design of the conventional piano. There is also an effect of realizing a soundproofing device that exhibits the effect.

In each of the above embodiments, the wire 36 is the lever 3
Although it is attached to the arm 4 or the arm 24, the wire 36 may be attached to the other arms 26 and 28 or the rail portion 22. The same applies to the spring 36a. Further, the rail portion 22 of the stop rail 20 is formed into a rod shape having a circular cross section, and a shock absorbing stopper cushion (cushion material) 30 on the surface thereof is adapted to the surface shape of the rail portion 22 so that the front surface (the hammer shank 6 is hit). The contact surface) has a protruding curved surface shape. As a result, even if the position where the hammer shank 6 is blocked, that is, the stop position is finely adjusted, the stopper cushion 30 always keeps the hammer shank 6 in place.
Since the same contact is made with respect to, and the sharp corner does not hit, the stop position is clearly determined. That is, even if the stop position is finely adjusted, the functions of the stop position and the retracted position can be clearly separated, and the fine adjustment of the stop position becomes easy. The same effect can be obtained even if the corners of the stopper cushion 30 that contacts the hammer shank 6 (the corners that form the edge of the surface on the contact side) are rounded.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a schematic configuration around a sound deadening device according to a first embodiment of an upright piano.

FIG. 2 is an explanatory perspective view of a stop rail.

FIG. 3 is a partial cross-sectional view illustrating a schematic configuration around a sound deadening device according to a second embodiment.

FIG. 4 is a partial cross-sectional view showing a schematic configuration around a sound deadening device according to a third embodiment.

FIG. 5 is an operation explanatory view of a stop rail of a conventional example.

[Explanation of symbols]

2 ... Action bracket 6 ... Hammer shank 7 ... Center rail 8 ... Support member 8a ... Fixed shaft 10 ... Damper lever 12 ... Damper lever wire 14 ... Felt 16 ... Damper head 18 ... Damper lever spring 20 ... Stop rail 22 ... Rail part 24 , 26, 28 ... Arms 24a, 26a, 28a ... Shaft part 30 ... Stopper cushion (cushion material) 32 ... Support part 34 ... Lever 36 ... Wire 3
6a ... Spring

Claims (5)

[Claims] 1. A plurality of arms, one end of which is pivotally supported by each support portion and the other end of which is swingable about the one end, a stop rail bridged between the other ends of the arms, and a key press. Based on the hammer, a stop position that abuts on the hammer shank to prevent movement of the hammer shank from the start of the string striking operation to the actual string striking, and the hammer is retracted from the stop position and the hammer is used. A sound deadening device for a piano, comprising: a switching mechanism capable of swinging and displacing the stop rail in a retracted position that enables striking of strings. 2. The sound deadening device for a piano according to claim 1, wherein the space between the arms is a swing space for a damper or a damper wire. 3. The sound deadening device for a piano according to claim 1, wherein the space between the arms is a swing space of a hammer or a hammer shank when striking a string. 4. The sound deadening device for a piano according to claim 1, wherein a corner of the stop rail that comes into contact with the hammer shank is rounded. 5. The surface of the stop rail on the side in contact with the hammer shank is a curved surface that projects.
A sound stop device for a piano according to any one of 1.